from flask import abort, jsonify
from flask import current_app
from flask import render_template
from flask import request
from flask import session
from flask import g
from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route("/comment_like",methods=["POST"])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg="用户为登录")

    # 1.取到请求参数
    comment_id = request.json.get("comment_id")
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    if not all([comment_id,news_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")

    if action not in ["add","remove"]:
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")

    try:
        comment_id = int(comment_id)
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")

    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not comment:
        return jsonify(errno=RET.NODATA,errmsg="评论不存在")

    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id==user.id,
                                                      CommentLike.comment_id==comment_id).first()
        if not comment_like_model:

            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment_id
            db.session.add(comment_like_model)

    else:
        # 取消点赞评论
        comment_like_model = CommentLike.query.filter(CommentLike.user_id==user.id,CommentLike.comment_id==comment_id).first()
        if comment_like_model:
            comment_like_model.delete()
    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        jsonify(errno=RET.DBERR, errmsg="数据库操作失败")

    return jsonify(errno=RET.OK,errmsg="OK")


@news_blu.route("/news_comment",methods=["POST"])
@user_login_data
def comment_news():
    """
    评论新闻或者回复某条新闻下指定的评论
    :return:
    """

    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg="用户为登录")

    # 1.取到请求参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")

    # 2.判断参数
    if not all([news_id,comment_content]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")
    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")

    # 查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="为查询到新闻数据")

    # 3.初始化一个评论模型，并且赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    # 为什么要自己去commit（）？，因为在return的时候需要用到comment的id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK,errmsg="0K",data=comment.to_dict())


@news_blu.route("/news_collect",methods=["POST"])
@user_login_data
def collect_news():
    """
    收藏新闻
    1.接收参数
    2.判断参数
    3.查询新闻，并判断新闻是否存在
    :return:
    """

    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg="用户未登录")

    # 1.接收参数
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    # 2.判断参数
    if not all([news_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")

    if action not in ["collect","cancel_collect"]:
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")

    # 3.查询新闻，并判断新闻是否存在
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="数据查询错误")

    if not news:
        return jsonify(errno=RET.NODATA,errmsg="为查询到新闻数据")

    # 4.收藏以及取消收藏
    if action == "cancel_collect":
        # 取消收藏
        if news in user.collection_news:
            user.collection_news.remove(news)
    else:
        if news not in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)
    return jsonify(errno=RET.OK,errmsg="操作成功")


@news_blu.route("/<int:news_id>")
@user_login_data
def news_detail(news_id):
    """
    新闻详情
    :return:
    """
    # 查询用户登录信息
    user = g.user
    # 右侧的新闻排行的逻辑
    news_list = []
    try:
        # 获取数据库新闻中点击来那个排行，从上往下排序。展示数为：limit(constants.CLICK_RANK_MAX_NEWS)
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    # 定义一个空的字典列表，里面装的就是字典
    news_dict_li = []
    # 遍历对象列表，将对象的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 查询新闻数据
    news = None

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)

    if not news:
        # 报404错误，404错误统一显示页面后续再处理
        abort(404)

    news.clicks += 1

    # 判断是否收藏该新闻，默认值为 false
    is_collected = False

    if user:
        # 判断用户是否收藏当前新闻，如果收藏：
        # collection 后面可以不用加all 因为sqlalchemy会在使用的时候自动加载
        if news in user.collection_news:
            is_collected = True
    # 查询评论数据
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id==news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    comment_dict_li = []

    for comment in  comments:
        comment_dict = comment.to_dict()
        comment_dict_li.append(comment_dict)

    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        "news": news.to_dict(),
        "is_collected": is_collected,
        "comments":comment_dict_li
    }

    return render_template("news/detail.html",data=data)